PURPOSE : A real estate investment system and a service supplying method through a real estate auction thereof are provided to guarantee a principal in investment and a profit through a free deal of right of share which is for fixed real estate and then secure stability.CONSTITUTION : An auction/public auction information collecting server(610) collects a auction information and a public auction information on a real time basis. A market value information collecting server(620) collects a current price information for the auction information and the public auction information. A real estate auction management server(630) determines an investment open recruiting about a real estate which satisfies a preset earnings rate by analyzing the current market price information. An investment contest server(640) records a contest list about the real estate which the investment contest is determined.COPYRIGHT KIPO 2012